2009 --> 24.5%

2008 --> (26.5%)

2007 --> 5.79% 

2006 --> 11.60%

2005 --> 4.47%

2004 --> 8.65%

2003 --> 20.68%

2002 -->(13.58%)

2001 --> (5.8%)

2000 --> (1.2%)

1999 --> 13.8%

1998 --> 13.8%

1997 --> 16.8%

1996 --> 14.5%

1995 --> 20.0%